Keywords
adult, appendage, arm, blackboard, caucasian, chalk, chalkboard, close up, close-up, closeup, color, color image, colour, education, educator, fellow, gentleman, guy, hand, horizontal, human, human being, indoor, indoors, inside, limb, male, man, mathematics, one, one person, only men, people, person, photography, teacher, tetra images, western european, writing, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, u10969233